Official NHA Assessment

Race 2: BREEDERS GUINEAS PLATE (Fillies) (For 3 year-old Fillies)

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Line Horse
North Star
Reference for assessment
Exact Matches
1 / 7
Calculated = Official
Close Matches
3 / 7
Within 2 points
Significant Diffs
2 / 7
More than 5 points
Detailed Assessment
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Pos  Horse                Age  Weight  Fin  Lengths  WFA   Pre   Race Rating  New   Adj  
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1    Royal City Girl      2    60.0    1    0.00     0.0   93    89           89    -4
2    North Star           2    58.0    2    0.25     0.0   85    85           85    +0
3    Shori Kai            3    58.0    3    0.50     4.0   70    82           82    +12
4    Silvan Mistress      2    60.0    4    1.75     0.0   85    92           92    +7
5    Barolo               2    54.0    5    3.50     0.0   79    78           78    -1
6    General Pardon       2    58.0    6    9.00     0.0   74    85           85    +11
7    Augusta Rosso        2    60.0    7    9.25     0.0   86    89           89    +3
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Horse-by-Horse Comparison

Pos Horse Pre-Rating Official New Calculated Discrepancy WFA (kg) Line Horse Calculation
1 Royal City Girl 93 93 89 +4 0.0 -
2 North Star Line 85 85 85 ✓ Match 0.0
3 Shori Kai 70 70 82 -12 4.0 -
4 Silvan Mistress 85 91 92 -1 0.0 -
5 Barolo 79 79 78 +1 0.0 -
6 General Pardon 74 72 85 -13 0.0 -
7 Augusta Rosso 86 86 89 -3 0.0 -
Assessment Methodology
Calculation Steps:
  1. Identify Line Horse - consistent performer used as reference
  2. Calculate WFA Allowance based on age, distance, and month
  3. Apply Drag Adjustment for beaten margin
  4. Calculate Actual Weight Performance:
    Weight - Drag - WFA
  5. Compare to Line Horse to determine race rating
  6. Apply special rules (maiden caps, layoff allowance)
Key Formulas:
  • Drag Effect: Varies by distance (see Benchmarks page)
  • 1 length ≈ 1kg at 1 mile (1600m)
  • WFA Scale: Based on Admiral Rous's 1855 table
  • Rating Points: 1kg = 2 rating points